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One of the paradoxes of the Internet is that, although it rewards celebrity stories and videos of kittens playing with yarn, it also rewards sites that go narrow and deep.

The reason is technological. While there aren’t as many people interested in the details of N.S.A. surveillance or prison conditions as there are people interested in sports or pop singers, the Internet allows them all to gather in one place.

And, when they do, the readership can be a substantial and influential one.